[chef] Re: Attach role to a floating IP address

[Noah Kantrowitz < >]

On Jan 24, 2012, at 2:43 PM, Alan Harper wrote:

> Hi Everyone,
> 
> I want to have my nodes find a virtual ip by searching for a role. In the 
> first instance, it is for application servers looking for the correct 
> database server to use, and which rabbitmq server to use, but I'm sure I'll 
> have some other usages soon.
> 
> Any advice, or should I look at this from another angle?

Funny, we were just talking about this the other day for Opscode's own 
network. We currently store this kind of stuff in a per-env data bag item, 
but somehow using nodes/roles/search is something we would like to be able to 
do. You can definitely create a "fake" node with a run-list and IP/FQDN 
filled in manually, but then you have to worry about it showing up in other 
searches (think `knife ssh '*:*' sudo apt-get update` or similar) so this 
isn't without downsides. There is some work being done to formalize the idea 
of "managed nodes" (nodes that don't correspond to something running 
chef-client itself, also referred to "external entities" some places), which 
would lead to more global best-practicies for this kind of thing. For now, 
though, you can certainly one-off it as long as you make sure all your other 
searches are carefully written (possibly add a "NOT managed:true" filter in 
some places). Hope this helps!

--Noah

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